I think it means three...
Tri is the Latin prefix for 3. Ex: Triangle (3 angles), tricycle (3 cycles(circles))
tri- has Latin, Greek as well as middle English origins.
Both. Latin and Greek inherited their words for "three" from a common ancestor (known as Proto-Indo-European), and in both languages "three" shows up as tri- in compounds. Examples:"triathlon" (from Greek): tri- + athlon"contest""trident" (from Latin): tri- + dens "tooth"
Greek and Latin and Sanskrit.
The prefix tri comes from Latin tres, meaning three and Ancient Greek τtria, also meaning three.
tricycle, triangle, triangular, trivia, trillion, tricep, triacid, triatomic, tri-city
tri = latin for three. (just a hint)
Trianle Tri is Latin for three, angle is of obscure derivation.
The previous answer here was "greek". Unfortunately, this is incorrect; perhaps it was a guess? The correct answer is Latin; reference: http://en.wikipedia.org/wiki/Greek_and_Latin_roots_in_English .
Latin: tri- (three) nomial (name)
Three. Tri is the Latin for three.
the "tri-flicer" if that is what you mean is a plane made in 1995.